Tilman shiver



@atten taire @anni @Hita IMPROVEMENT I-N LIFTING-JAGKS.

dlp Sangatte nimh tu in tigen trttw ntent mit mating. gaat nt tigetinus.

TO ALL'WHOM 1T MAY CONCERN:

Be it known that 1, TILMAN SHIVER, of Newburg, in the county of Warrick,and State of Indiana, have invented a new and improved Lifting-Jack; andI do hereby declare that the following is a full, clear, and exactdescription thereof, reference being had to the accompanying drawings,making a part of this specification, in which- Figure 1 is an elevationof one side of the jack, showing the lifting-bar elevated to its highestpoint.

Figure 2 is a sectional view of the jack, with the parts in the sameposition as 'shown in fig. 1.

Figure 3 is a sectional view of the same parts,`showing the lifting-bardepressed to its lowest point.

Similar letters of reference indicate corresponding parts in the severalfigures.

The object of this invention is to obtain a self-locking lifting-jackwhich shall be very simple in construction and operation, and by which aload can be elevated and sustained'in an elevated position without theuse of racks and pawls, hooks and chains, or other similar contrivances.i v

The nature ot' my invention consists in applying, to a standard ofsuitable length and strength, a sliding' stepped lifting-bar, so as toslide freely up and down without displacement; and in connecting saidbar to the short arm of a vibrating lever-handle by means of a strongrod, the upper end of which is curved or hooked in such manner that whenthe lifting-bar is elevated to its highest point the curved upper end ofsaid rod will pass over the-fulcrum oil the lever, and thus lock the barin the elevated position, as will be hereinafter described.

To enable others skilled in the art to understand my invention, I willdescribe its construction and operation.

In the accompanying drawings, A represents a standard, which may be madeof Wood or metal, with a foot-stand, A', for affording the requiredwidthiot` base. B is a lifting-bar, which is fitted to the straight edgeol" the standard A, and held in place by means of the straps a a, sothat it will slide freely up and down. The upper enlarged end of thislifting-bar B is stepped, as shown at b b, for the purpose of adaptingthe jack to lift-loads diierent heights. A recess, c, is.` made in thebar B, and a recess, d, is also made in` the standard A for the purposeof receiving and allowing of the free vibration of a bar, C, as shown infigs. 2 and 3. This bar is strongly pivoted at its lower straight end tothe lifting-bar B, near the lower end of the latter. The upper end ofthis bar C is curved outward, so that its extreme upper end is nearly atright angles to its straight porf, tion. This curved end of said bar ispivotcd by a pin, e, to the short segment f 0f a lever-handle, G, shownin igsfQ-and 3, which is pivoted at i to the upper portion of thestandard A. v

When the lifting-bar B is depressed, by raising the handle G the bar Cwill fall into the recess c, and the pivotal connection at e will fallinward, or within the spaces c and d. In the act oi' raising thelifting-bar B, the point e will move upward and outward, so as to falloutside of the fulcrum z'of the handle G; thus, when the handle isbrought to the position shown in iig. 2, with its segmentj bearing uponthe shoulder at g, the hai B will be locked in position, and anytendency to depress it will be resisted by the shoulder g and the handleGQ To depress the lifting-bar B it is only necessary to raise thehandle, and thus move the point e inward and downward.

One great advantage of my lifting-jack over others which are operated bylevers, is that the lifting-bar B is elevated to its highest point byone downward stroke of the handle or lever Gr, and at the saine timesustained tirmlyin such position. Then, by a single stroke of saidhandle the lifting-bar is unlocked and depressed, thus admitting of themanipulation of the jack with one hand, while the object to be elevatedor depressed can be held and steadied by the other hand. The arrangementand construction of the handle G and bar C, herein described, relievesthe stops a a, which guide the bar B, from strain in lifting a heavyload. as the downward pressure of the load tends to force the bar Binward, or toward the standard A.

The distinguishing feature of my lifting-jack is this: The lever Grtakes hold 0f the link er bar C at the top thereof, by which means' theoperator is enabled to pull up the part B of 'the jack by a downwardthrust, which downward thrust is effected without stooping so as tobring the hands almost down to the ground, as in the operation of theliftingjacks patented by S. G. Jones, January 23, 1855; R. 1V. Davis,April 14, 1857; and H. S. Shepardson, January 1, 1857; J. F. Hammond,.August 21, 1866; N. Badgley, June 23, 1863; and others known to me. 1tis by having the bar C pivoted at its lower end, and curved over itsupper end, and fitting said bar in the recesses r: c and cl d of theparts A B of the jack, that the twofold advantage of lifting the part Bby taking hold of the top of the linli or bar C, and of making is on thepart B, is secured. The bar C has a lateral movement in th posesintended, as will be'evident from figs. 2 and 3 of the drawings.

I do not claim lifting the part B by a. lever .to secure by LettersPatent, is-

The construction and arrangement of the laterally vil) 'and at its upperend .to the lever G, which is pivoted to th recessed, as at c d,

seid bar C self-locking when the weight4 e recesses c c d suHieient forthe puras this is old; but what I do claim as my invention, and desirerating bm' C, pivoted at its lower end tio the part B,

e part; A. of the jack; the said parts A and B being substantially asand for the purpo`se described.

'IILMAN SHIVER.- Witnesses:

JOHN A. STOUT, y

JAMES T. GRAY.

